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process for the preparation of difenilmetan dicarbammati and polimetilen carbamati
process for the preparation of difenilmetan dicarbammati and polimetilen carbamati
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机译:地芬尼坦二卡巴马汀和波美替尼卡巴马蒂的制备方法
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摘要
Diphenylmethane dicarbamates and polymethylene polyphenyl carbamate homologs and derivatives of these compounds are produced by the condensation of N-aryl carbamic acid esters, such as ethylphenylcarbamate, with formaldehyde, para-formaldehyde or trioxane in the presence of an organic sulfonic or halogenated organic sulfonic acid which has an acid concentration of at least 75 percent, at temperatures of from ambient to about 170 DEG C. and optionally in the presence of an inert solvent.
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